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ADS1298 - Inverted Chest Leads

Juan Rizzato1
Prodigy 70 points
Other Parts Discussed in Thread: ADS1298

Hi,

I am working with the ADS1298 and i am getting the chest leads inverted. I have atached some figures showing the signals and the hadware. Also i am ataching part of my code where i configure the wilson central terminal.

This is my own software and as you can see the chest leads are inverted.

Here you can see how I conected LL, RA and LR

And this is how i have configured WCT1 and ACT2 registers:

WCT2 = 0b00001001;     (RA in IN1N [and IN2N])

WCT2 = 0b11000010;     (LA in IN1P y LLen IN2P)

What could be inverting the chest leads?

Thanks in advance!!!!!!!!!!

  • 0
    Prodigy 70 points

    I forgot to mention that V1is not inverted. All the other 5 are.

    Regards!

  • 0 in reply to Juan Rizzato1
    TI__Guru 63196 points

    Hi Juan, 

    Nice work on your progress so far!

    Honestly, I'm not sure what might cause the inverted chest leads that you see. From the ADS1298's perspective, you appear to be using the device properly. Someone with higher medical expertise may advise you to derive the WCT and chest leads a little differently, that part I'm not an expert on.

    From what I do know, it is not uncommon to see some leads look inverted from the others. If you think of each lead as a different "camera angle" viewing the heart's electrical activity, it makes sense that you see a difference as you move across the chest from V1 to V6.

    If you do discover another reason, please share it. :)

    Saludos,

  • 0 in reply to Ryan Andrews
    Prodigy 70 points

    Thank you very much for your answer!

    You are absolutely right about that is not uncommon to see some leads look inverted from the others but the thing is that the ECG that is shown in the figure is from an ECG generator and with our old hardware (the old hardware we are trying to improve/exchange for the ADS1298) shows the chest leads inverted with respect to what we get with the ADS. Up to know, I have just manage to invert them by firmware, it is not a big deal.

    By the way, V1 it is inverted, even if I said in my last post that it was not. Sorry about that. With my ECG generator, V1 should be inverted with respect the others.

    Regards